已知x=2+√3/2-√3,y=2-√3/2+√3,求5x^2-16xy+5y^2
√x(√x+2√y)=√y(6√x+5√y,求x-3√xy+2y/x+√xy-6y
已知2X-3√xy-2y=0(x>0)求2x²+xy-9y²分之x²+4xy-16y
已知x,y为正数,且√x(√x+√y)=3√y(√x+5√y),求(2x+√xy+3y)/(x+√xy-y)
已知xy/x+y=3,求代数式2x-5xy+2y/x-3xy+y
已知xy/x+y=2,求代数式3x-5xy+3y/-x+2xy-y的值
已知X+Y分之XY=2,求-X+3XY-Y分之3X+5XY+3Y
已知x-y=2xy,求代数式3x-5xy-3y/x+xy-y的值
已知xy=2(x+y),求(5x-xy+5y)/(3xy-x-y)的值
已知xy/(x+y)=2求(3x-5y+3y)/(-x+3xy-y)
已知xy/x+y=2,求代数式3x-5y+3y/-x+3xy-y
已知x,y>0 2x+y+3=xy 求5x+4y最小值
已知xy^2=-2,求-xy(x^2y^5-xy^3-y)的值.